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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbc7b41b1d1352b4005d909a3d3458bcdf71b531989f498c0e69fbfaf3d2073' 
  AND token = 'Wot//PWa0FhjKCPTyll7yD2fVjMbNUpMSvjrAJVA8zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}